a controversial issue, under president bush, now president obama. the fact that the government does have the power, and the authority, to kill an american overseas that's considered a threat. and how do they define that? >> that's the question because when you say imminent, it could be imminent in a few hours, in a few weeks, saying you can target a member of al qaeda, senior operational al qaeda leader, or associated forces. how are you defining associated forces? how are you defining the word imminent? how are you defining the word threat? all of these things are things that are open to interpretation and has civil liberties groups, as well, worried about what this means as far as the u.s., executive powers authority to decide, based on kind of unclear, sometimes, terms in terms how they're defined to go ahead and assassinate a u.s. citizen abroad. when you look at the justice department memo, as you said, leaked and made public by nbc, 16 pages. details the case for the use of those armed drones, which are terribly unpopular outside of the united